Question

Află numărul necunoscut: (6 x n): 3 = 10 (n +72): 4 = 20 (56 + n): 2 = 30 (2 x n): 3 = 10 8 x (n: 7) = 48 9 x (45:n) = 45 36 = 36 x (nn) 90 = 75 + 5 xn​

Answer 1

Răspuns:

Explicație pas cu pas:

( 6 × n ) : 3 = 10

6 × n = 10 × 3

6 × n = 30

n = 30 : 6

n = 5

____________________

( n + 72 ) : 4 = 20

n + 72 = 20 × 4

n + 72 = 80

n = 80 - 72

n = 8

_______________

( 56 + n ) : 2 = 30

56 + n = 30 × 2

56 + n = 60

n = 60 - 56

n = 4

____________

( 2 × n ) : 3 = 10

2 × n = 10 × 3

2 × n = 30

n = 30 : 2

n = 15

_______________________

8 × ( n : 7 ) = 48

n : 7 = 48 : 8

n : 7 = 6

n = 6 × 7

n = 42

______________

9 × ( 45 : n ) = 45

45 : n = 45 : 9

45 : n = 5

n = 45 : 5

n = 9

_________________

36 = 36 × ( n × n)

n × n = 36 : 36

n × n = 1

n = 1

______________________

90 = 75 + 5 × n

5 × n = 90 - 75

5 × n = 15

n = 15 : 5

n = 3